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/* $OpenBSD: testdb.c,v 1.9 2015/01/16 06:40:17 deraadt Exp $ */ |
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/*- |
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* Copyright (c) 1992, 1993 |
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* The Regents of the University of California. All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* 3. Neither the name of the University nor the names of its contributors |
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* may be used to endorse or promote products derived from this software |
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* without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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* SUCH DAMAGE. |
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*/ |
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#include <sys/types.h> |
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#include <sys/sysctl.h> |
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#include <db.h> |
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#include <fcntl.h> |
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#include <kvm.h> |
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#include <limits.h> |
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#include <paths.h> |
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#include <stdio.h> |
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#include <string.h> |
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#include <unistd.h> |
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#include "extern.h" |
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/* Return true if the db file is valid, else false */ |
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int |
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testdb(char *dbname) |
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{ |
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DBT rec; |
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DB *db = NULL; |
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size_t kversionlen; |
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char kversion[LINE_MAX]; |
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int mib[2], ret = 0; |
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/* Read version string of running kernel */ |
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mib[0] = CTL_KERN; |
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mib[1] = KERN_VERSION; |
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kversionlen = sizeof(kversion); |
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if (sysctl(mib, 2, kversion, &kversionlen, NULL, 0) < 0) |
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goto close; |
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/* Read the version out of the database */ |
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if ((db = dbopen(dbname, O_RDONLY, 0, DB_HASH, NULL)) == NULL) |
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goto close; |
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rec.data = VRS_KEY; |
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rec.size = sizeof(VRS_KEY) - 1; |
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if ((db->get)(db, &rec, &rec, 0)) |
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goto close; |
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if (rec.data == NULL || rec.size > kversionlen) |
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goto close; |
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/* If they match, we win */ |
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ret = memcmp(kversion, rec.data, rec.size) == 0; |
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close: |
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if (db) |
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(void)(db->close)(db); |
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return (ret); |
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} |